lawrence



(No Model.)

L. P. LAWRENCE.

POWER BRAKE.

No. 403,539. Patented May-21, 1889.

WITNESSES:

w. f $7M Arm/mm,

N PETERS. Plwwumn n vwr, Walh'mglon. I16.

UNITED STAT S PATENT OFFICE.

LOUIS P. LAIVREN CE, OF PASSAIC, NEW JERSEY, ASSIGNOR TO THE LAIV- RENCERAIIAVAY BRAKE COMPANY, OF NElV YORK, N. Y.

POWER-BRAKE.

SPECIFICATION forming part of Letters Patent No. 403,539, dated May 21,1889.

Application filed November 22, 1888. Serial No. 291,535. (No model.)

To ctZZ whom it may concern.-

3e it known that I, LOUIS P. LAWRENCE, of Passaic, in the county ofPassaic, and in the State of New Jersey, have invented certain new anduseful Improvements in Power- Brakes, of which the following is aspecification.

The object of my invention is to provide certain new and usefulimprovementsin power-brakes, whereby the construction is simplified, thecost reduced, and the power increased to a very great extent.

The invention consists in the construction and combination of parts anddetails, as will be fully described and set forth hereinafter, andfinally pointed out in the claim.

In the accompanying drawings, Figure l is a plan view of my improvedpower-brake, showing the manner in which it is applied. Fig. 2 is avertical transverse sectional view 011 the line :0 at, Fig. 1, partsbeing omitted. Fig. is a side view.

Similar letters of reference indicate corresponding parts.

The brake-shoes A, which may be of any well-known construction, areattached to the saddles A, fastened on the ends of the brakebeams B.

To the inner side of one of the brake-beams B the vacuum-cylinder O issecured in any well-known manner, said cylinder containing the piston D,provided with the piston-rod E. The cylinder 0 is longer than it iswide, as shown in Figs. 1 and 2, and its longer axis extends in thedirection of the length of the brake-beam. The cylinder is constructedin this shape, so as to project but slightly from the top and bottom ofthe brake-beam, but yet have the requisite area to produce the necessarypressure. If the cylinder were made circular it would project so farfrom the top and bottom of the brake-beam as to strike against theprojections on the roadway between the rails. The rod F, flexiblyconnected with the outer end of the piston-rod E, is passed through anaperture in the other or opposite brake-beam B, and on the projectingend of said rod the nut G is screwed for the purpose of tightening saidrod more or less. \Vhen by means of an ejector or other suction devicethe airis exhausted from the space between the closed end of thecylinder and the piston D, the pressure of the exterior air presses thepiston D in the direction of the arrow ac and pulls the rod F in thesame direction. Thereby the brake-beams B are pressed toward each otherand the brake-shoes A are pressed against the rims of the wheels ll.

Having thus described my invention, I claim as new and desire to secureby Letters Patent The combination, with two brake-beams carrying shoeswhichare adjacent to the rims of wheels, said beams being mounted tomove toward each other when pressing the shoes against the rims of thewheels, of a brakecylinder secured to the inner surface of onebrake-beam, a piston in said cylinder mounted to move toward the inneredge of the brakebeam to which its cylinder is secured while operating,and a rod connected with said piston and with the other brake-beam,substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

LOUIS P. LAlVRENCE.

\Vitnesses:

OSCAR F. GUNZ, CARL KARP.

